I got my girlfriend's little brother hooked on reef keeping and I'm helping him set up his tank when i go home for Thanksgiving Break. On the way home we're buying the supplies he needs, but after 6 months of taking care of my tank, i'm still a little confused when it comes to filtration. I've read multiple times that only LR and a protein skimmer is best, and others recommend refugium also...what do you recommend to get him started?